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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Missing uninitialized variable warning."
href="https://llvm.org/bugs/show_bug.cgi?id=28872">28872</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missing uninitialized variable warning.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mathieu.bosi@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Hi
Code such as:
int main(void)
{
int value = value; // value is garbage, no warning is generated
return 0;
}
Does not trigger any warning.
Using the uninitialized value to access an array or any STL container (e.g.
std::map) does not trigger any warnings either.
e.g.
std::map<int> hashmap;
int foo = hashmap[foo];
On the other hand, the proper warning appears in code like this:
int foo(int bar)
{
return bar;
}
int main(void)
{
int value = foo(value); // <-- proper warning is generated
}
I'm not even sure why C++ allows such syntax (maybe some kind of shortcut for
non plain-old-data / classes?) but it sure caused a (easy to track down) bug in
the code I was working on.
NOTE: I did not know which clang version to select from the Bugzilla spinner.
'clang --version' returns:
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
Cheers</pre>
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